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Nature of the business, Assets acquired (Details)
$ in Millions
3 Months Ended
Jan. 29, 2019
USD ($)
Dec. 14, 2018
USD ($)
MW
Dec. 11, 2018
USD ($)
kV
Feb. 28, 2018
USD ($)
MW
Mar. 31, 2019
Dec. 28, 2018
USD ($)
Oct. 10, 2018
USD ($)
Befesa Agua Tenes, S.L.U. [Member]              
Nature of the business [Abstract]              
Ownership interest 51.00%            
Equity value of agreed price $ 24.5            
Consideration payment advanced $ 19.9            
Interest rate 12.00%            
Chile TL3 [Member]              
Nature of the business [Abstract]              
Gross capacity | kV     66        
Acquisition purchase price     $ 6.0        
Ownership interest         100.00%    
ATN [Member]              
Nature of the business [Abstract]              
Acquisition purchase price           $ 16.0  
Ownership interest [1]         100.00%    
Melowind [Member]              
Nature of the business [Abstract]              
Percentage interest acquired   100.00%          
Gross capacity | MW   50          
Acquisition purchase price   $ 45.0          
Ownership interest         100.00%    
Mini- Hydro [Member]              
Nature of the business [Abstract]              
Percentage interest acquired       100.00%      
Gross capacity | MW       4      
Acquisition purchase price       $ 9.0      
Ownership interest         100.00%    
PTS [Member]              
Nature of the business [Abstract]              
Percentage interest acquired             5.00%
Acquisition purchase price             $ 7.0
[1] Including the acquisition of ATN expansion 1.